An arthrogram involves the administration of contrast into which area?

An arthrogram specifically involves the administration of contrast material directly into a joint space. This procedure is typically performed to visualize the internal structures of the joint, including cartilage, ligaments, and other soft tissues, using imaging techniques such as X-rays or MRI. By injecting contrast into the joint, the healthcare provider can obtain clearer images and assess for any abnormalities, injuries, or pathologies.

The other options describe the usage of contrast in different anatomical areas: the subarachnoid space is related to procedures like a myelogram, where contrast is injected for spinal imaging; the bladder pertains to a voiding cystourethrogram (VCUG); and the epidural space is involved in epidural injections for pain management or anesthesia. Each of these procedures targets specific areas for different diagnostic objectives, highlighting their distinction from an arthrogram.